We’re pleased to announce the first public release of our GeoGebra Graphing Calculator! It’s for Android phones and tablets right now, iPhone and Windows will follow, watch this space!

For the first release it has the graphics and algebra views but we will be adding lots more features over the coming months. We have prepared the foundations so everything necessary is already working under-the-hood (for example the CAS engine, and you can create – but not yet display – 3D objects).

There are also some extra-cool goodies to enjoy:

• brand-new native equation editor
• long-tap on an object to change its properties
• drag sliders and animate them in the Algebra View
• freehand drawings and shape recognition
• everything is running natively (LaTeX, CAS, graphics drawing etc) so it is super-slick to use
• search, open and save from/to GeoGebraTube
• find out more in our tutorial Graphing Calculator Tutorial

You can download it in the Play Store now for Android phones and tablets – please let us know your ideas for improvements with the “Send Feedback” option or in our Mobile Apps forum.

The GeoGebra community is all about creating and sharing great materials for learning math & science. Thanks to you, we now have more than 300,000 free and interactive worksheets and books.

But wouldn’t it be nice to also hear back from your students or colleagues who you shared your materials with? We think so too! That’s why we have created GeoGebra Groups:

• Supercool and easy collaboration between students and teachers, colleagues, and really just everyone nice out there!
• Invite others using your Group Code
• Post texts, images, videos, pdfs and GeoGebra worksheets to your Group
• Add questions and interactive GeoGebra tasks for your students and give them feedback
• Discuss your ideas with everyone or individual Group members using comments
• Find out how to do all that and more in our GeoGebra Groups Tutorial

Try out our Groups, start to collaborate in a new way, and let us know what you think!

www.geogebra.org/groups

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GeoGebra Summer of Code 2015

This summer, GeoGebra was again part of Google Summer of Code (GSoC) supporting young and talented open source coders. We had a very strong field of 64 students applying and were able to choose 4 of them to work with us during this summer. There were also some impressive contributions submitted by many of the other candidates which have already been incorporated into GeoGebra.

Yi-Chun (Jacky) Kuo: Native iOS App

Jacky

Our current iPad app is based on a WebView so we were interested to see if Jacky could make a prototype of a native app using the quite-new RoboVM cross-compiler to convert GeoGebra’s Java code into Objective C. As part of his application he managed to get the JLaTeXMath formula engine working which was very impressive in its own right. For the first half of his project he got the full GeoGebra kernel compiled and running and for the second half he worked on drawing objects and user-interaction.

There is still a lot to do before we can make a release (for example implementing the toolbar and equation editor) but Jacky will stay on with GeoGebra after GSoC to help!

GeoGebra running in Xcode

Georgios Ouzounis: Handwritten Equation Recognition

Georgios

Handwritten equation recognized!

Georgios made a nice web app as part of his application to collect example handwritten equations from phones and tablets and store them in a database. This was important as it allowed him to use that data when testing and training his algorithms. The three parts to his project were:

• splitting the equation into its symbols
• recognising the symbols
• converting that back into GeoGebra syntax

and by the end of his project it was successfully recognizing indices, fractions and square-roots. At the moment the code is running server-side and is a little slow so the challenge for the future will be to get it running faster and client-side. Open Source libraries used: OpenCV

Thilina Madumal: Intersection Project

Polygon Intersections in 2D and 3D!

As part of Thilina’s application, he adapted the Clipper library to compile with Java 6 and with GWT and incorporated it into GeoGebra, which he then used as part of his main GSOC project to improve the polygon operations within GeoGebra.

He has also done a lot of work on improving the Intersect command to allow the intersection of many more object types to be calculated dynamically.

Shamshad Alam: Implicit Curves Project

cos(x y) = k

x⁴ + y⁴ + z⁴ = 2

Shamshad also made some nice experiments with the Clipper library as part of his application

The main focus of his GSoC project was to implement plotting of implicit curves and surfaces, namely:

• plotting of non-polynomial implicit curves (for example you can try sin(x) – sin(y) = 1 in GeoGebra Beta)
• plotting of implicit surfaces (eg x⁴ + y⁴ + z⁴ = 2)
• extending commands for rotation, translation and other transformations to work with these object types

Thanks to all our GSoC students for a great job done during this summer!

We’ve made a major change to GeoGebraTube and our Chrome App. We have updated the formula renderer (otherwise known as LaTeX renderer) to use the same version as in the desktop version. This means that mathematical formulas in our applets and web application will now look just as beautiful as they do in GeoGebra’s desktop version. This will work with all existing formula commands as well (for example TableText, FormulaText, FractionText, StemPlot).

Here’s an example of the new version using our new super-pretty formulas:
tube.geogebra.org/student/m33487

If you have any questions or suggestions concerning these new updates, please write to us at support@geogebra.org